Adjustable throw eccentric



April 18, 1933. y C. W. MUELLER ADJUSTABLE THROW ECCENTRIG Filed Nov.18, 1931 2 Shees-Sluaerl l 5 v 1 4 75 /5 /5 W j' /9 8 -r-'n f- /l i 3 i7 7 I W i :f 79

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Gttome I April 18, 1933. C' w MUELLER 1,903,932

ADJUSTABLE THROW ECCENTRI C Filed Nov.` 18,1931 2 sheets-sheet 2linventot',

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UNITED Is'ra'rlas PATENT oFF-ICE CHABLIS W. IUELLEB, Ol' ST. LOUIS,ISSOUBI, ASSIGNOR TO LEWIS INVISIBLE STITCH COMPANY, Ol' ST. LOUIS,MISSOURI, CORPORATION O F MAINE ADJUSTABLE THROW ECCENTBIC Applicationmed November 18, 1931. SeriaIIo. 575,880.

This. invention relates generally to new and useful improvements inadjustable throw eccentrics, althou h the invention is particularlyintende for use in sewing machines for varying the feed stroke of thefeed dog.

Among the several objects of the invention are to provide an adjustableeccentric assembly wherein the throw of the eccentric may be readilyadjusted and wherein the eccentric when adjusted will be retainedagainst accidental displacement; to provide indicating means for easilyobserving the amount of adjustment given -to the eccentric; to providesuch an assembly with a comparatively few number of parts; and toprovide such a construction which is easy to assemble or disassemble.

With these and other objects in view which will more fully appear, thenature of the invention will be more clearly understood by following thedescription, the appended claims, and the several views illustrated inthe accompanying drawings.

In the drawings Figure 1 is a plan view of a construction embodying myinvention, f Figurei2 is a 'longitudinal sectional view thereof, V

Figure 3 is a right hand eleva-tion of the assembly,

Figure 4 is a sectional view taken on the line 4-4 of Figure 1,

Figure 5 is a sectional view 'taken on the line 5-5 of Figure 1 Figure 6`is a left hand -end elevation of the assembly,

Figure 7 is a pers ective view showlng the parts of the assem ly inseparated relation,

Figure 8 is a detail sectional view showing the frictional connectionbetween the driving eccentric and the adjustable eccentric, and

Figure 9 is a detail' section showing the pivotalconnection between thedriving link and the driving eccentric.

Like reference numerals designate corresponding parts throughout theseveral res of the drawings.

y invention comprises a shaft 5 having a driving disc 6 mounted thereonand rigidly secured thereto through the medium of an eccentric 7 whichis integral with the v'disc and is fixed to the shaft by a set screw 8.A hub 9 is integral with the disc 6 vand extends laterally therefrom ina direction op osite the eccentric 7, and the hub is providedJ withangularfseats 10, 10 which project inwardly from .the outer edgethereof. Rotatably mounted on the hub 9 relative to the shaft 5, is afeed adjusting or driving eccentric 11 having a disc 12 integral withthe end thereof opposite the driving disc 6. A sewing machine feed ordriven eccentric 13 having a bearing opening 14 is fitted about the feedadjusting eccentric 11. Formed in the inner face of the disc 6 alongside the feed eccentric 13, is a recess 14a in which one end of adriving link 15 is pivotally connected to the disc 6 by a pivot screw16. .The other end 70 ofthe link 15 is pivotally connected to the feedeccentric 13 by a pin 17 which is fixed to the eccentric and projectsinto a pivot opening 18 formed in the link, thus forming a separableconnection between the eccentric and the link. The major axis of thelink which extends between the pivots 16 and 18 is positioned tangentialto an imaginary circle having for its center the axis of the shaft 5.The recess 14:l isof sufficient depth to permit the link 15 to swingabout its pivot 16 forv a limited extent. It will therefore be seen thatwhen the disc 12 is turned about the shaft 5, the feed adjustingeccentric 11 will be turned therewith and the feed travel eccentric 13will be moved radially of the shaft 5 to vary the throw thereof, subjecthowever to a slight distortion due tothe 2-point connections 15, 16, 17between said eccentric and the driving disc 6.

The periphery of the adjusting disc 12 is provided with spaced numerals19, such as 3, 4, 5, etc., which are adapted to indicate the amount ofthrow of the eccentric 13 in different positions of adjustment of thedisc 12. An indicator disc 20 is mounted on` the shaft 5 on the side ofthe adjusting disc 12 opposite the feed travel eccentric 13, and isprovided with a hub' 21 which lits within the bearing opening of thedisc 12 and is pro 100 vided with longitudinally extending integral lugs22 which engage in the seats 10 of the hub 9 of the driving disc.6 tothereby retain the indicator disc against rotation relative to the shaft5. A clamping collar 23 is placed against the outer face of the disc 20and is secured to the shaft 5 by a set screw 24.

In order to retain the feed travel eccentric 13 in different positionsof radial adjustment or throw, I have provided the inner face of thedisc 12 with anl arcuate series of seats 24 which registerradially withthe respective numerals 19, and have mounted in the ecce'ntric 13 aspring pressed plunger 25 which is adapted to engage any one of theseats 24a and thereby frictionally retain the eccentric in its adjustedposition.

The indicator disc 20 is provided with a finger 26 which overhangs theperiphery of the disc 12 and cooperates with the numerals 19 to assistthe operator in reading the position of adjustment of the feed traveleccentric 13. It will therefore be seen that the indicator finger 26 andthe indicator disc 20 have a separable interlocking connection 22, l0with the shaft 5 and consequently said finger and disc are supported onthe shaft to rotate therewith. From the foregoing it will be observedthat the parts may be readily assembled or disassembled; that theassembljT is composed of comparatively few parts, and is therefore cheapto manufacture.

Itis of course to be understood that the details of structure andarrangements of parts may be variously changed and modified withoutdepartingfrom the spirit and scope of my invention.

I claim 1. In an adjustable throw eccentric, the combination with ashaft, of a driving disc fixed to the shaft, an adjusting eccentric rotatable about the shaft and located along side the driving disc, anadjusting disc fixe to the adjusting eccentric and located at the endthereof opposite the driving disc, a driv-4 ing eccentric surroundingthe adjusting eccentric, a driving link connection between the drivingdisc and the driving eccentric, and means cooperating with the adjustingdisc and the drivin eccentric for retainin the same against re ativemovement in di erent positions of adjustment of the adjusting eccentric.

2. In an adjustable throw eccentric, the combination with a shaft, of adriving disc fixed to the shaft, an adjusting eccentric rotatable aboutthe shaft andlocated along side the driving disc, an adjusting discfixed to the adjusting eccentric and located at the end thereof oppositethedriving. disc, a driving eccentric surrounding the adjustingeccentric, a driving link connection between the driving disc and thedriving eccentric, the major axis of the link being positioned tantheadjusting eccentric and located at the end thereof opposite the drivingdisc, a driv-v ing eccentric surrounding the adjusting eccentric, saiddriving disc being provided with a recess in register with the drivingeccentric, a driving link located in said recess and having pivotalconnections at its ends with the driving disc and the driving eccentric,and means cooperatingwith the adjusting disc and the driving eccentricfor retaining the same against relative movement in different positionsof adjustment of the adjust-y ing eccentric.

4. In an adjustable throw eccentric, the combination with a shaft, of adriving disc fixed to the shaft, an adjusting eccentric rotatable aboutthe shaft and located along sidel the driving disc, an adjusting discfixed to the adjusting eccentric and located at the end thereof oppositethe driving disc, a driving eccentric surrounding the adjustingeccentric, said driving disc being provided with a recess inregisterwith the driving eccentric, a driving link located in saidrecess and having pivotal connections at its ends with the driving discand the driving eccentric, the major axis of the link being positionedtangential to an imaginary circle having for its center the axis of theshaft, and means cooperating with'the adjusting disc and the drivingeccentric for retaining the same against relative movement in differentpositions of adjustment of the adjusting eccentric.

5. In an adjustable throw eccentric, the combination with a shaft, of adriving disc fixed to the shaft, an adjusting eccentric rotatable aboutthe shaft and located along side the driving disc, an adjusting discfixed to the adjusting eccentric and located at the end thereof oppositethe driving disc, a driving eccentric surrounding the adjustingeccentric, a pivotal connection between the driving disc and the drivingeccentric, the peripheryl of the adjusting disc being provided with aseries of spaced indicating numerals, means cooperating with theadjusting disc and the driving eccentric for retainingv the same againstrelative movement indifferent posiica tions of adjustment of theladjusting eccentric, and an indicator disc mounted on the lao peripheryof the adjusting disc `for coopera.- tion with the numerals on theperiphery of` said disc.

6. In an adjustable throw eccentric, the combination with a shaft, of adriving disc fixed to the shaft, an adjusting eccentric rotatable aboutthe shaft and located along side the driving disc, an adjustin discfixed to the adjusting eccentric and ocated at the end thereof oppositethe driving disc, a driving eccentric surrounding the adjustingeccentric, a pivotal connection between the driving disc and the drivingeccentric, the peripher of the adjusting disc being provided wit aseries of spaced indicating numerals, the inner face of the adjustingdisc being provided with an arcuate series of seats arranged in radialrelation with the respective numerals on the disc, a spring pressedplunger mounted in the driving eccentric for cooperation with any one ofsaid seats to rictionally retain the adjusting eccentric and the drivingeccentric against relative rotation, and indicating means rotatable withthe shaft and cooperating with the numerals on the periphery of theadjusting disc.

7. In an adjustable throw eccentric, the combination with a shaft, of adriving disc fixed to the shaft to rotate therewith and provided with ah ub having an angular seat extending inwardly from its outer end, anadjusting eccentric rotatably mounted on the hub, an adjusting discfixed to the end of the f adjusting eccentric opposite the driving discand provided on its periphery with a series of spaced indicatingnumerals, a driving eccentric surrounding and fitting the adjustingeccentric, the driving disc having a recess in register with the drivingeccentric, a driving link located in said recess and having one endpivotally connected to said driving disc, the other end of the linkbeing provided with a pivot opening, a pin ixed to the driving eccentricand removably fitted in the pivot openin of the link, the major axis ofthe link being positioned tangential to an imaginary circle having orits center the axis -of the shaft, the inner face of the adjusting discbeing provided' with an arcuate series of seats arranged in radialrelation with respect to the numerals on the disc, a spring pressedplunger mounted in the driving eccentric for engaging any one of saidseats to frictionally retain the driving eccentric against accidentalmovement relative to the adjusting eccentric, an indicator disc mountedon the shaft on the side of the adjusting disc opposite the di'ivingeccentric and provided with a hub formed with a longitudinally extendinglug having separable interlocking connection with the angular seat ofthe driving disc hub, an'indicator finger mounted on the shaft to movetherewith and overhanging the periphery of the adjusting disc forcooperation with the indicating numerals thereon, and a clamping collarremovably fixed to the shaft and bearin against the indicator disc.

n testimony whereof I ailix my signature.

CHARLES W. `MUELLER.

